diff --git a/AZ3166/src/libraries/WiFi/src/AZ3166WiFi.cpp b/AZ3166/src/libraries/WiFi/src/AZ3166WiFi.cpp
index c830e6a8a..2ea00de89 100644
--- a/AZ3166/src/libraries/WiFi/src/AZ3166WiFi.cpp
+++ b/AZ3166/src/libraries/WiFi/src/AZ3166WiFi.cpp
@@ -85,12 +85,12 @@ int WiFiClass::begin(void)
     return WL_CONNECT_FAILED;
 }
 
-int WiFiClass::begin(char* ssid)
+int WiFiClass::begin(const char* ssid)
 {
     return this->begin(ssid, NULL);
 }
 
-int WiFiClass::begin(char* ssid, const char *passphrase)
+int WiFiClass::begin(const char* ssid, const char *passphrase)
 {
     if (!is_wifi_inited)
     {
@@ -143,7 +143,7 @@ int WiFiClass::disconnect()
     return WL_SUCCESS;
 }
 
-int WiFiClass::beginAP(char* ssid, const char *passphrase)
+int WiFiClass::beginAP(const char* ssid, const char *passphrase)
 {
     if(is_ap_inited)
     {
diff --git a/AZ3166/src/libraries/WiFi/src/AZ3166WiFi.h b/AZ3166/src/libraries/WiFi/src/AZ3166WiFi.h
index f76fb553d..ee990fcd9 100644
--- a/AZ3166/src/libraries/WiFi/src/AZ3166WiFi.h
+++ b/AZ3166/src/libraries/WiFi/src/AZ3166WiFi.h
@@ -47,7 +47,7 @@ class WiFiClass
      * param passphrase: Passphrase. Valid characters in a passphrase
      *        must be between ASCII 32-126 (decimal).
      */
-    int begin(char* ssid);
+    int begin(const char* ssid);
 
     /* Start Wifi connection with passphrase
      * the most secure supported mode will be automatically selected
@@ -56,7 +56,7 @@ class WiFiClass
      * param passphrase: Passphrase. Valid characters in a passphrase
      *        must be between ASCII 32-126 (decimal).
      */
-    int begin(char* ssid, const char *passphrase);
+    int begin(const char* ssid, const char *passphrase);
 
 
     /* Start Wifi connection with access point mode
@@ -66,7 +66,7 @@ class WiFiClass
      * param passphrase: Passphrase. Valid characters in a passphrase
      *        must be between ASCII 32-126 (decimal).
      */
-    int beginAP(char* ssid, const char *passphrase);
+    int beginAP(const char* ssid, const char *passphrase);
 
     /*
      * Disconnect from the network